Editing Kuzyk quantum gap (section)

==Applications==
Recently, researchers have been using [[nanotechnology]] to link molecules together to increase the nonlinear susceptibility.  Since the connected molecules have more electrons, collective motions of these electrons yield enhanced nonlinear response.  Since calculations show that the Kuzyk limit increases faster than linearly, it is best to link together as many molecules as possible.  Researchers have made a material of interconnected fullerenes that appear to breach the Kuzyk quantum gap. However, if all electrons are correctly counted, then the gap may not have been breached.   In either case, the absolute value of the nonlinearity achieved is impressive, and these kinds of materials may some day supercharge the internet.<ref> [https://web.archive.org/web/20040820045639/http://news.nationalgeographic.com/news/2004/08/0819_040819_nanointernet.html breach the Kuzyk quantum gap]</ref>

The nonlinear susceptibility is the fundamental material property that is the basis of many other important applications.  Nonlinear optical materials can be used to convert light to shorter (bluer) wavelengths, which can be focused to a smaller spot size (the minimum possible beam size is proportional to the wavelength.)  Shorter wavelength light sources would hence yield higher density optical recording media (such as DVDs and CDs).  Other applications include tunable light sources, image recognition systems and adaptive optics.

Kuzyk's calculations can be used to predict the behavior of optical devices, guide synthetic chemists to make better materials, and to gain a deeper understanding of how light interacts with matter.  This process is leading to many interesting advances in new material synthesis paradigms, which should make new types of [[photonics|photonic]] devices possible.

Perhaps most importantly, the Kuzyk Limit can be used to calculate the [[intrinsic hyperpolarizability]], which is a scale invariant quantity that can be used to compare molecules of different sizes.